Import of the watch repository from Pebble

third_party/jerryscript/js_tooling/generate_snapshot.js

@@ -0,0 +1,74 @@
+#!/usr/bin/env node
+
+// generate_snapshot.js is a barebones tool for creating snapshots from within an automated process,
+// with the goal of eliminating build-time dependencies in exchange for a more narrow set of
+// capabilities
+
+var fs = require('fs');
+var jsCompiler = require('./js_tooling');
+
+function writeToFile(argv, dataToWrite) {
+    var data;
+    if (Array.isArray(dataToWrite)) {
+        data = byteArrayToStr(dataToWrite);
+    }
+    else if (typeof dataToWrite == 'object') {
+        data = JSON.stringify(dataToWrite);
+    }
+    else {
+        data = dataToWrite;
+    }
+    fs.writeFileSync(argv.output, data, 'binary');
+}
+
+function byteArrayToStr(arr) {
+    var result = '';
+    for (i = 0; i < arr.length; i++) {
+        result += String.fromCharCode(arr[i]);
+    }
+    return result;
+}
+
+if (require.main === module) {
+    if (process.argv.length < 4) {
+        console.log("Usage: " + __filename + " JS_FILE OUTPUT [MEMORY_REPORT]");
+        process.exit(-1);
+    }
+    var js_file = process.argv[2];
+    var output_file = process.argv[3];
+
+    var snapshot_size_file = 'snapshot_size.json';
+    if (process.argv.length == 5) {
+        snapshot_size_file = process.argv[4];
+    }
+
+    var expectedArgs = {
+        prefix: function(v) {return decodeURIComponent(v)},
+        maxsize: function(v) {return parseInt(v)},
+        padding: function(v) {return parseInt(v)}
+    };
+
+    var options = {};
+    Object.keys(expectedArgs).forEach(function(k) {
+        var idx = process.argv.indexOf('--' + k);
+        if (idx >= 0) {
+            options[k] = expectedArgs[k](process.argv[idx+1]);
+        }
+    });
+
+    var js = fs.readFileSync(js_file, 'utf8');
+    var result = jsCompiler.createSnapshot(js, options);
+
+    if (result.result != 'success') {
+        console.error(result['result'] + ':', result['reason']);
+        process.exit(1);
+    } else {
+        writeToFile({'output': output_file}, result['snapshot']);
+
+        // This call writes out the bytecode memory usage for
+        // /tools/resources/resource_map/resource_generator.py to read. Please update that file
+        // if you make changes to the output format/filename here
+        var snapshot_size_data = {size: result['snapshotSize'], max: result['snapshotMaxSize']};
+        writeToFile({'output': snapshot_size_file}, snapshot_size_data);
+    }
+}